Punching machinery.



\ l I l J 1 11 j ZZZ ZM Patented; June 1Q, 1913.

2.SEEETSSHEET 2.

G. P. THOMAS.

PUNGHING MACHINERY APPLICATION FILED 00117, 1911',

mmml WITN ESSESI rarnnronrrcn GEORGE PAUL THOMAS, OF PITTSBURGH, PENNSYLVANIA,

'PUNCHING MACHINERY.

' Specification of Letters latent.

Application filed October 17, 1911. Serial No. 655,222,

To all 1071 0912, z'tmmy concern:

Be it known that I, GEORGE PAUL THOMAS, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, a citizen of the United States, have invented or discovered certain new and useful Improvements in Punching Machinery, of which improvements the following is a specification.

In modern structural-iron and steel ,shop-practice various sections and plates (particularly the latter) are frequently punched by what are commonly called multiple plate-punches}: which usually consist of a vertically, reciprocating head, mounted within a suitable stationary frame and provided with a series'of horizontally adjustable punch-holders. Oppositely disposed with reference' to such punch-holders aseries of die-holders is mounted upon the stationary frame, each of which is also horizontally adjustable to the end that a die' may register with each punch; and, to complete the machine, a carriage, suit-ably mounted upon a skid is employed to operatively engage and drag the blank of material over the dies and beneath the punches. been engaged by such a carriage, the several punch and die holders are adjusted to be in a position wherein holes may be punched, lying along predetermined longitudinal parallel lines of the blank.

My invention has to do with machines of the character described, and the object thereof is to facilitate the accomplishment of the adjustment of punch and dieholders.

In the accompanying drawings, which form part of the specification, Figural is a vertical sectional view of a portion of a multiple-punch embodying my invention; Fig. 2 a similar view of a modification of the punch, shown in Fig. 1; and Fig. 3 a

side elevation of the punch, shown in Fig. 2.

In the several figures like numerals are used to designate like parts.

In the machine, shown in Fig. 1, a reciprocating block 1, adapted to adjustably sustain punch-holders 2, is mounted within the upper part of a stationary frame 3; and adjustable die holders d are secured to the lower partof the said frame. On the right side of the machine a vertically adjustable stripper 5, having horizontally adjustable stripping-blocks 6, is also secured to the Usually, before the blank has frame 3, while on the left is shown the usual series of shafts '7, carrying horiaontally adjustable levers 8, which are connected to the gags 9, to the end that the operation of the several punches 10 may be controlled as de sired. And it wild be understood of this last-named feature that as manyas and whatever punches are desired may be controlled, by any of' the shafts, through an operating hand-lever 11, after the proper con-' nections have been established. I

As usually constructed, the punch-holders 2 are secured to the reciprocating-block 1. each by means of securing members, such as bolts, disposed on opposite sides of the said block. Such a method of securing the punch holders is frequently undesirable in so much as thebolts on one or the other side of the blocks may be rendered inaccessible by adjacent machine parts, such as the stripper 5, so that, in order to 'makean ad justment of the punch-holders, the interfering part must be partially removed. To overcome this objectionable feature of a two-bolt attachment of the punch-holder to the reciprocating block and at the same time sacrifice none of the advantages of security obtained by the ordinary two-bolt constructioml provide the block 1 and the punch-holder 2 with suitable interlocking and bearing surfaces to the endthat the punch holder may be held firmly and adjustably in position by a single bolt 13. Preferably, I arrange such interlocking means and bearing surfaces as are shown in the drawings. Referring particularly to Fig. 1 the head 1 has a slot 12, 'adapted to receive and operatively sustain the head of the bolt 13, and further adapted to receive a lateral extension 18 of the holder 1. oppositely disposed with reference to the mounting of the punch 10 within the punchholder, a second tongue-like extension 14; is formed on the punch-holder, which extension is engaged by a suitable recess in the vertical thrust surface formed on the end of'the tongue-like extension 14, and a hori zontal bearing surface extending on both sides of the punch 10. It will be under-.

stood that the horizontal surface 20 receives the vertical pressure due to the operation of the punch, and the vertical thrust surfaces withstand the strain due to the tightening of the bolt 13. And by unloosening the nut or nuts 15 of the bolt or bolts '13,

series of punch-holders, and in consequenceof this position of the stripper it becomes desirable to mount the die-holders in such a manner that they may be adjusted by manipulating securing members'disposed on the side which is freely accessible. To this end I make the die-holders 4* of substantially the same form as the punch holders 2, heretofore described, having extensions 14. and 18%, thrust surface 17 and bearing surface 20, and I make the die-holder mounting.

portion of the frame 3 of substantially the same form as the corresponding part of the head 1. Furthermore, in this construction, the several operating shafts 7" and 7 ,may be manipulated from one side of the machine by the levers Y11 and 11 respectively, the lever 8 of the shafts 7 being connected, as by rods 16, to the levers 11, as will be clearly understood from the drawing.

I do not wish to limit myself to the details I of construction shown herein or to the specific use of my tool holder, for, obviously, many changes and different applications may be made by those skilled in the art without departing from the spirit of my invention.

I claim herein as my invention:

1. In a tool-operating machine, the combination with a tool-carrying member, of a tool-provided tool-holder attachable to and removable from said member at one side thereof and in a line at right angles to the line of action of the said tool, means located on the said attachment-side of the saidmember for securing said holder to said member, said holder provided with detents at each side of the line of action of said tool, and said holder further provided with a bearing surface. transversely to and extending across the line of action of the sald tool, substantially asdescribed.

2. In a punching-machine, the combina tion of a movable head provided with an adjustable punch-holder, a frame provided with a die holder, a securing bolt and a punch mounted in said punch-holder, said head havinga longitudinal recess enlarged at its inner end to receive and sustain the said securing bolt, and with a second recess to receive a tongue extensionv of the said punch-holder, said punch-holder and movable head provided. with cooperating thrust and bearing surfaces, substantially as described. I

3. In a tool operating machine, the combination with a tool-carrying member, of a removable tool holderlaterally applicable to said member, two pairs of thrust surfaces formed one upon said member and the other upon said holder, each of the said surfaces facing in the direction of lateral applicability andtransversely thereto, the relative positions of said pairs of surfaces being on opposite sides of the line of strain and offset or staggered relative to one another, and clamping means effective in'the direction of I assembling.

4. In a tool operating machine, the combination with a tool-carrying member, of a removable tool holder laterally applicable to said member, detents formed upon said holder, cooperating recesses formed upon said member and effective to engage said Y detents, said detents being disposed on each side of the line of action of said tool and effective to resist the strain upon said tool-- in said line of action thereof, and clam ing means effective in the direction of app icability of said tool holder.

5. In a punching machine the-combination of a reciprocating head provided with two series of laterally adjustable punchholders and a second member provided with two series of oppositely disposed laterally adjustable die-holders, a stripper disposed between said two series, said, adjustable punchholders and die-holders each secured to their sustaining members by securing bolts.

. disposed in their outwardly extending portions, the said punch-holders and die-holders having thrust and bearing surfaces cooperating with the securing bolts to hold the said holders in operative position, substantially as described.

In testimony whereof I have hereunto set my hand.

GEORGE PAUL THOMAS. WVitnesses:

PAUL N. CRITOHLOW,

Bm'rnron FITZGERALD. 

